package server;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import mapper.MyClassLoader;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

import java.io.IOException;
import java.io.InputStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.*;

/**
 * Minicat的主类
 */
public class Bootstrap {
    /** 定义监听端口号*/
    private  int port=8081;

    //项目路径
    private String webappsPath="";
    //host : 127.0.0.1  context : demo   wrapper : /lagou
    private Map<String,Map<String,Map<String,HttpServlet>>> hosts = new HashMap<>();

    public int getPort() {
        return port;
    }

    public void setPort(int port) {
        this.port = port;
    }
    /**minicat启动需要初始化展开得一些操作*/
    public  void  start() throws Exception {
        //加载解析相关的配置
        loadServletByMany();
        //定义一个线程池

        int corePoolSize=10;
        int maximumPoolSize=50;
        long keepAliveTime=100L;
        TimeUnit unit=TimeUnit.SECONDS;
        BlockingQueue<Runnable> workQueue=new ArrayBlockingQueue<>(50) ;
        ThreadFactory threadFactory=Executors.defaultThreadFactory();
        RejectedExecutionHandler handler =new ThreadPoolExecutor.AbortPolicy();


        ThreadPoolExecutor threadPoolExecutor = new ThreadPoolExecutor(
            corePoolSize,
            maximumPoolSize,
            keepAliveTime,
            unit,
            workQueue,
            threadFactory,
            handler);

        ServerSocket serverSocket = new ServerSocket(port);

        while(true) {
            Socket socket = serverSocket.accept();
            RequestProcess requestProcessorr = new RequestProcess(socket,hosts,webappsPath);
            threadPoolExecutor.execute(requestProcessorr);
        }

    }
    private Map<String,HttpServlet> servletMap=new HashMap<String,HttpServlet>();


    private void loadServletByMany() {
        InputStream resourceAsStream = this.getClass().getClassLoader().getResourceAsStream("server.xml");
        SAXReader saxReader = new SAXReader();


        try {
            //解析server.xml
            Document document = saxReader.read(resourceAsStream);
            Element rootElement = document.getRootElement();
            List<Element> portNodes = rootElement.selectNodes("//Connect");
            Element element = (Element) rootElement.selectSingleNode("//Connect");
            port = Integer.parseInt(element.attributeValue("port"));

            List<Element> hostsEle = rootElement.selectNodes("//Host");//获取host

            for (int i = 0; i <hostsEle.size() ; i++) {
                String hostName = hostsEle.get(i).attributeValue("name");

                //项目集
                Map<String,Map<String,HttpServlet>> contexts =new HashMap<>();
                webappsPath = hostsEle.get(i).attributeValue("appBase");//host对应项目路径路径
                webappsPath = webappsPath.replaceAll("\\\\","/");

                File file = new File(webappsPath);
                if(file.exists() && !file.isFile()) {

                    File [] files = file.listFiles();
                    for (int j = 0; j < files.length; j++) {
                        //项目
                        Map<String,HttpServlet> context = new HashMap<>();
                        String webPath = files[j].getPath();//项目路径
                        //单个项目文件名
                        String fileName = webPath.replace(file.getPath()+"\\","");
                        //读取web.xml文件
                        File webXml = new File(webPath+"\\web.xml");
                        InputStream resourceAsStreamWeb = new FileInputStream(webXml);
                        SAXReader saxReaderWeb = new SAXReader();


                        Map<String,HttpServlet> wrapper = new HashMap<String,HttpServlet>();
                        //解析各个项目web.xml
                        try {
                            Document documentWeb = saxReaderWeb.read(resourceAsStreamWeb);
                            Element rootElementWeb = documentWeb.getRootElement();

                            List<Element> selectNodes = rootElementWeb.selectNodes("//servlet");
                            for (int k = 0; k < selectNodes.size(); k++) {


                                Element elementWeb =  selectNodes.get(k);
                                // <servlet-name>lagou</servlet-name>
                                Element servletnameElement = (Element) elementWeb.selectSingleNode("servlet-name");
                                String servletName = servletnameElement.getStringValue();
                                // <servlet-class>server.LagouServlet</servlet-class>
                                Element servletclassElement = (Element) elementWeb.selectSingleNode("servlet-class");

                                String servletClass = servletclassElement.getStringValue();//class绝对路径
                                // 根据servlet-name的值找到url-pattern
                                Element servletMapping = (Element) rootElementWeb.selectSingleNode("/web-app/servlet-mapping[servlet-name='" + servletName + "']");
                                // /lagou
                                String urlPattern = servletMapping.selectSingleNode("url-pattern").getStringValue();
                                String pakageDir = webPath.replaceAll("\\\\","/");
                                MyClassLoader loader = new MyClassLoader(pakageDir+"/");
                                Class<?> clazz  = loader.findClass(servletClass);
                                wrapper.put(urlPattern, (HttpServlet) clazz.getClassLoader().loadClass(servletClass).newInstance());
                            }

                        } catch (DocumentException e) {
                            e.printStackTrace();
                        } catch (IllegalAccessException e) {
                            e.printStackTrace();
                        } catch (InstantiationException e) {
                            e.printStackTrace();
                        } catch (ClassNotFoundException e) {
                            e.printStackTrace();
                        }

                        //context.put(fileName,);
                        contexts.put(fileName,wrapper);
                    }
                }
                if("localhost".equalsIgnoreCase(hostName)){
                    hosts.put("127.0.0.1",contexts);//增加127.0.0.1 对应 localhost
                }
                hosts.put(hostName,contexts);
            }
        } catch (DocumentException e) {
            e.printStackTrace();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        Bootstrap bootStrap = new Bootstrap();
        try {
            bootStrap.start();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}